I believe the correct answer is: iambic pentameter.
The first line “Not marble, nor the gilded monuments” of William Shakespeare’s “Sonnet LV” is written in iambic pentameter, the line of verse which consists of five metrical feet, one short (or unstressed) syllable followed by one long (or stressed) syllable. Therefore, every second syllable is emphasized.
D. clear
an adjective describes a noun and clear is describing the waters